Mitras' ice and physical damage are fearsome. Equip Green Vest (グリーンベスト) to tackle the ice attack and have a Jack Frost (ジャックフロスト) or Makara (マカラ) as teammates. Rakukaja and Tarunda can also lower the damage.

Light of Order can instantly kill a team demon. Phantasmal Dream inflicts damage and down status, causing victims to lose MP each turn. Bring some dis-down item (ディスダウン) or a demon with Downdi spell (ダウンディ).

E1: Conversation with Mansemat (マンセット) >
"It seems you no longer considered me the same as the demons around here, right?"(私が、ここの悪魔どもとは違う者だと認めてはもらえてるでしょうかね？) >
You look like trust worthy (あなたは頼りにできる)/
You seem different than other demons (悪魔とは違うようだ)/
Well, I would go that far to assume so. (まだそういうわけには)

E1: Conversation with Orcus >
* "How do human being with with over production?" (ニンゲンは多過ぎる産物をどうするのだ？)
Human beings can learn how to suppress that. (人は抑制できるようになる)/
Human beings can produce based on the needs. (必要があって作られたものだ)/
There are destructive forces, even among human beings. (壊す力も人間にはある)

Squeeze inflicts physical damage, Orcus will also recover (damage x 0.5) points of HP. Orcus also uses Meal Preparation to summon a Kataki-rauwa, which can cast Mudo. Sometimes Orcus would use Gluttony, swallow the Kataki-rauwa and rip half of the prey's current HP.

Spam fire attack to trigger Devil COOP. Since Orcus relies on physical attacks, Rakukaja and Tarunda also work. However, if you stalk them up to four tiers, Orcus will use Dekaja and Dekunda to dispel them, so stop at about 3 tiers.

Mission 18

E15: Conversation with Mansemat >
"Science with demons, how do you handle this great power?" (科学に悪魔、大きな力の扱いは…？)It's fine if we use it carefully. (気を付けて使えば問題ない)/
I was left no choice but to use it. (仕方なく使ってるだけだ)/It's none of your concern. (あなたに関知されたくない)

Mission 19

E2: Conversation with Kresnik (クルースニク) >
"Are we going to see a peaceful era?" (今は平和な時代を迎えていますか？) >
There is not that much of a difference. (たいして変わらない)/
It's just a cruel world described differently. (別の意味でひどい時代だ)/
We are working to recover the peace. (平和を取り戻すために活動している)

Conversation with Asura (アスラ). >
"Can't you see the deterioration of human souls?" (人間の霊が衰えゆくのを見逃すのか？) >That's just an unreal accusation. (有りもしない言いがかりだ)/
Demons are the reason. (悪魔がその原因だ)/They will soon reincarnate. (すでに再生を始めている)

Ausrarouga inflicts mad status to the whole party, causing the victim to attack either the enemies or allies. This skill is guaranteed in the first term, so assign all members to guard. Scorching Darkness is a random fire-based attack, and Asura (skill) is a random attack. Asura is weak against ice, so spam ice attack to trigger Devil COOP.

Asura fusion is unlocked after the battle.

Obtain Demon's Ulna (魔王の尺骨) and Rosetta:Del (ロゼッタ：Del).

Return to Red Sprite.

Red Sprite (レッドスプライト号)

Conversation with Zelenin >
"Decided to go back to the ground without any worries?" (心おきなく地上へ戻れそう？)
Certainly, I would love to return as soon as possible (そうだ、早く戻りたい)/
I am still caught on something… (引っ掛かるところはある)/
Well, it's not like that we can just escape from here. (脱出できると決まった訳じゃない)

Return to the laboratory and obtain main application Forma Search B (フォルマサーチB)

There are some floors here that cause poison and sleep status. Develop sub-application like Nurse (ナース) and Medic (メディック) to reduce the negative effects.

E4: Event with Jiminez. >
"Wake him up?" (起こしますか？) >
Shake him to wake him up (ゆすって起こす)/
Not wake him up (起こさない)
"Beat him to wake him up?" (殴って起こしますか？)
Yes (はい)/
No (いいえ)
"Kick him to wake him up?" (蹴り飛ばして起こしますか？)
Yes (はい)/
No (いいえ)
Obtain 5 Patra Stone (パトラストーン).